mirror of
https://github.com/mickael-kerjean/filestash
synced 2025-12-19 23:05:04 +01:00
80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
// Copyright (C) 2021 Storj Labs, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package monkit
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// CallbackTransformer will take a provided callback and return a transformed one.
|
|
type CallbackTransformer interface {
|
|
Transform(func(SeriesKey, string, float64)) func(SeriesKey, string, float64)
|
|
}
|
|
|
|
// CallbackTransformerFunc is a single function that implements
|
|
// CallbackTransformer's Transform.
|
|
type CallbackTransformerFunc func(func(SeriesKey, string, float64)) func(SeriesKey, string, float64)
|
|
|
|
// Transform implements CallbackTransformer.
|
|
func (f CallbackTransformerFunc) Transform(cb func(SeriesKey, string, float64)) func(SeriesKey, string, float64) {
|
|
return f(cb)
|
|
}
|
|
|
|
// TransformStatSource will make sure that a StatSource has the provided
|
|
// CallbackTransformers applied to callbacks given to the StatSource.
|
|
func TransformStatSource(s StatSource, transformers ...CallbackTransformer) StatSource {
|
|
return StatSourceFunc(func(cb func(key SeriesKey, field string, val float64)) {
|
|
for _, t := range transformers {
|
|
cb = t.Transform(cb)
|
|
}
|
|
s.Stats(cb)
|
|
})
|
|
}
|
|
|
|
// DeltaTransformer calculates deltas from any total fields. It keeps internal
|
|
// state to keep track of the previous totals, so care should be taken to use
|
|
// a different DeltaTransformer per output.
|
|
type DeltaTransformer struct {
|
|
mtx sync.Mutex
|
|
lastTotals map[string]float64
|
|
}
|
|
|
|
// NewDeltaTransformer creates a new DeltaTransformer with its own idea of the
|
|
// last totals seen.
|
|
func NewDeltaTransformer() *DeltaTransformer {
|
|
return &DeltaTransformer{lastTotals: map[string]float64{}}
|
|
}
|
|
|
|
// Transform implements CallbackTransformer.
|
|
func (dt *DeltaTransformer) Transform(cb func(SeriesKey, string, float64)) func(SeriesKey, string, float64) {
|
|
return func(key SeriesKey, field string, val float64) {
|
|
if field != "total" {
|
|
cb(key, field, val)
|
|
return
|
|
}
|
|
|
|
mapIndex := key.WithField(field)
|
|
|
|
dt.mtx.Lock()
|
|
lastTotal, found := dt.lastTotals[mapIndex]
|
|
dt.lastTotals[mapIndex] = val
|
|
dt.mtx.Unlock()
|
|
|
|
cb(key, field, val)
|
|
if found {
|
|
cb(key, "delta", val-lastTotal)
|
|
}
|
|
}
|
|
}
|